(Adds details on ethics probe, 2004 surgery)

By David Bailey

MINNEAPOLIS, July 27 (Reuters) - U.S. Representative Jesse Jackson Jr. has been admitted to the renowned Mayo Clinic in Rochester, Minnesota, to be evaluated for depression and gastrointestinal ailments, the congressman's office said on Friday in a statement released by the clinic.

The statement came more than two weeks after the Illinois Democrat, son of civil rights leader and former presidential candidate, the Reverend Jesse Jackson, was said by his doctor to be undergoing treatment for a "mood disorder."

The younger Jackson, 47, announced in late June that he had taken a leave from office two weeks earlier for treatment of what was then described as exhaustion.

Amid mounting political pressure to disclose more information about his medical condition, Jackson said on July 5 through a statement that his problems were more serious than previously believed, adding he needed extended in-patient treatment for unspecified "physical and emotional ailments."

On July 11, his physician said the congressman was receiving intensive care for a "mood disorder" and was expected to make a full recovery.

The statement on Friday marked the first time that Jackson, who is seeking re-election to a 10th term in the House of Representatives in the Nov. 6 election, acknowledged he was being evaluated for depression.

"Congressman Jesse Jackson Jr. has arrived at Mayo Clinic in Rochester, Minnesota, for extensive inpatient evaluation for depression and gastrointestinal issues," the statement said without elaborating.

The statement did not say whether the gastrointestinal issues being evaluated were connected to a gastric bypass surgery Jackson underwent in 2004 for weight loss.

It said further information would be released as Jackson's evaluation proceeded.

Jackson's Republican opponent in November, Brian Woodworth, said in early July that Jackson had an obligation to clarify his situation. Woodworth could not immediately be reached for comment on Friday night.

Jackson has been the subject of a congressional ethics committee probe over an alleged bribe offered to former Illinois Governor Rod Blagojevich by a Jackson supporter in 2008.

The offer was intended to entice Blagojevich into appointing Jackson to President Barack Obama's vacant U.S. Senate seat. Jackson has admitted to lobbying for the seat but has denied knowing about any money offered to Blagojevich, who was convicted of public corruption charges and is in prison.

Two fellow Illinois Democrats, U.S. Senator Dick Durbin and U.S. Representative Luis Gutierrez, said this month that Jackson owed voters from his South Side Chicago district an explanation.

They compared the congressman's situation with those of stricken Illinois Republican U.S. Senator Mark Kirk and Illinois Democratic U.S. Representative Bobby Rush.

After Kirk suffered a stroke in January, his doctors held news conferences about his condition, and the senator later provided a video depicting his rehabilitation and showing him speaking and struggling to walk on a treadmill.

Rush had surgery for throat cancer, and Gutierrez said at the time, "We knew where to find him." (Reporting and writing by David Bailey; Editing by Steve Gorman and Peter Cooney)

Earlier on HuffPost:

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  • Jesse Jackson Jr.

    FILE - In this March 21, 2010 file photo, Rep. Jesse Jackson, Jr., D-Ill., uses his PDA to photograph demonstrators outside on the U.S. Capitol as the House prepares to vote on health care reform in Washington. When Jackson disappeared on a mysterious medical leave in June 2012, it took weeks for anyone in Washington to notice. Jackson has never lived up to the high expectations on the national stage.

  • Jesse Jackson, Jr.

    FILE - In this Jan. 5, 2011 file photo, Rep. Jesse Jackson, Jr., D-Ill., is pictured before a ceremonial swearing in of the Congressional Black Caucus on Capitol Hill in Washington.

  • Jesse Jackson Jr.

    FILE - In this May 16, 2011 file photo, U.S. Rep. Jesse Jackson Jr. attends ceremonies for Chicago Mayor-elect Rahm Emanuel in Chicago. (AP Photo/Charles Rex Arbogast, File)

  • Jesse Jackson Jr.

    FILE - In this Tuesday, March 20, 2012 file photo, U.S. Rep. Jesse Jackson Jr., D-Ill., thanks supporters at his election night party in Chicago. Jackson's office announced Monday, June 25, 2012 in a news release that the congressman has been on a medical leave of absence since June 10 and is being treated for exhaustion. (AP Photo/M. Spencer Green, File)

  • Jesse Jackson Jr., Sandi Jackson

    U.S. Rep. Jesse Jackson Jr., D-Ill., and his wife Chicago Alderman Sandi Jackson, thank family members at his election night party Tuesday, March 20, 2012, in Chicago after his Democratic primary win over challenger, former Rep. Debbie Halvorson, in the Illinois' 2nd District. (AP Photo/M. Spencer Green)

  • Jesse Jackson Jr., Sandi Jackson

    U.S. Rep. Jesse Jackson Jr., D-Ill., and his wife Chicago Alderman Sandi Jackson, embrace at his election night party Tuesday, March 20, 2012, in Chicago after his Democratic primary win over challenger, former Rep. Debbie Halvorson, in the Illinois' 2nd District. (AP Photo/M. Spencer Green)

  • Timothy Geithner, Jesse Jackson Jr.

    Treasury Secretary Timothy Geithner, right, declines an offer by U.S. Rep Jesse Jackson Jr., D-Ill., to talk to reporters during a tour of the Ford Motor Company Stamping Plant in Chicago Heights, Ill., Wednesday, April 4, 2012. (AP Photo/Charles Rex Arbogast)

  • U.S. Rep. Jesse Jackson Jr., Sandi Jackson

    U.S. Rep. Jesse Jackson Jr. and his wife, Chicago Alderman Sandi Jackson, ask each other for their support and votes as they arrive at a polling station for early voting, Friday, March 9, 2012, in Chicago. (AP Photo/M. Spencer Green)